Add .clang-format to match current formatting.

[bodea]

It looks like an update to clang-format-action may have changed the default, as the code was previously formatted with clang-format (64c067d).

Apply resulting style to a couple of comments.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.80%. Comparing base (5824715) to head (b38a116).
⚠️ Report is 46 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #100   +/-   ##
=======================================
  Coverage   58.80%   58.80%           
=======================================
  Files           2        2           
  Lines         403      403           
  Branches       87       87           
=======================================
  Hits          237      237           
  Misses        100      100           
  Partials       66       66           

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